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Go find the spec sheets on the various brands and check the base material. That is your answer. Each manufacturer has it's name for each base material. For example Amsteel Blue is the Sampson rope trade name for UHMWPE based cordage. Once you understand the various names you are throwing around you will have your answer.

Vectran is advertised as having less 'creep' than Amsteel. Whether it does or not, I've found Amsteel to be better for splicing. The holes I've made (e.g. for the bury in a whoopie sling or UCR) open up in Vectran more markedly. Might be that it's a looser weave, I dunno. I stick with Amsteel now.